Ravens, extremely smart adversary?
Most people associate this bird with dead animals and egg stealing. The truth of the matter is, he is an opportunist that is just extremely smart for a bird and knows how to take advantage of his surroundings. University studies have found that he is able to identify people's faces, which means if you wrong a raven he will remember it and harass you as long as he lives. Not only that, he has the ability to teach his offspring that this person is not to be trusted. This species has been known to steal coins out of vending machines, use tools to gather food and to elicit other species of animals to help them find food.
Instead of considering the Raven to be an adversary, you may just want to consider him to be an ally. As I mentioned before ravens will elicit other species of animals to help them gather food. This symbiotic relationship with predators such as coyotes, hawks and eagles can be turned to your advantage. The ravens will follow these predators in hopes of stealing food from the predators. So if you hear a raven, you may well expect a predator to also be nearby. Many a time I did not see the coyote or other predator until it was too late, but I always heard or saw the ravens before such an event.
Since then I have many times thanked the raven for letting me know there were predators nearby, thus giving me the opportunity to protect my poultry, or any other livestock prone to such predators. You may not see the predators, but I assure you the raven does.